- 1: methods and attitudes typical of or attributed to the natural scientist
- 2: an exaggerated trust in the efficacy of the methods of natural science applied to all areas of investigation (as in philosophy, the social sciences, and the humanities)
Scientism is a term used, often pejoratively, to refer to belief in the universal applicability of the scientific method and approach, and the view that empirical science constitutes the most authoritative worldview or most valuable part of human learning to the exclusion of other viewpoints. It has been defined as "the view that the characteristic inductive methods of the natural sciences are the only source of genuine factual knowledge and, in particular, that they alone can yield true knowledge about man and society." An individual who subscribes to scientism is referred to as a scientismist. The term scientism frequently implies a critique of the more extreme expressions of logical positivism and has been used by social scientists such as Friedrich Hayek, philosophers of science such as Karl Popper, and philosophers such as Hilary Putnam and Tzvetan Todorov to describe the dogmatic endorsement of scientific methodology and the reduction of all knowledge to only that which is measurable.
Scientism may refer to science applied "in excess". The term scientism can apply in either of two equally pejorative senses:
- To indicate the improper usage of science or scientific claims. This usage applies equally in contexts where science might not apply, such as when the topic is perceived to be beyond the scope of scientific inquiry, and in contexts where there is insufficient empirical evidence to justify a scientific conclusion. It includes an excessive deference to claims made by scientists or an uncritical eagerness to accept any result described as scientific. In this case, the term is a counterargument to appeals to scientific authority.
- To refer to "the belief that the methods of natural science, or the categories and things recognized in natural science, form the only proper elements in any philosophical or other inquiry," or that "science, and only science, describes the world as it is in itself, independent of perspective" with a concomitant "elimination of the psychological dimensions of experience."
For sociologists in the tradition of Max Weber, such as Jürgen Habermas, the concept of scientism relates significantly to the philosophy of positivism, but also to the cultural rationalization of the modern West.
E. F. Schumacher, in his A Guide for the Perplexed, criticized scientism as an impoverished worldview confined solely to what can be counted, measured and weighed. "The architects of the modern worldview, notably Galileo and Descartes, assumed that those things that could be weighed, measured, and counted were more true than those that could not be quantified. If it couldn't be counted, in other words, it didn't count."